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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 JnuBF/xyGvbrS468UNRPLjfMpxs/NHP7SlD8KGD24foyPNQUquBFJnXdkZrwxfuG
 4ct0skZWkXDdNYjxvaAWLw==

<SEC-DOCUMENT>0001468729-09-000001.txt : 20090723
<SEC-HEADER>0001468729-09-000001.hdr.sgml : 20090723
<ACCEPTANCE-DATETIME>20090723134444
ACCESSION NUMBER:		0001468729-09-000001
CONFORMED SUBMISSION TYPE:	3/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090709
FILED AS OF DATE:		20090723
DATE AS OF CHANGE:		20090723

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MAGELLAN PETROLEUM CORP /DE/
		CENTRAL INDEX KEY:			0000061398
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				060842255
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		10 COLUMBUS BLVD
		STREET 2:		10 FLOOR
		CITY:			HARTFORD
		STATE:			CT
		ZIP:			06106
		BUSINESS PHONE:		8602932006

	MAIL ADDRESS:	
		STREET 1:		10 COLUMBUS BLVD
		STREET 2:		10 FLOOR
		CITY:			HARTFORD
		STATE:			CT
		ZIP:			06106

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MAGELLAN PETROLEUM CORP PANAMA
		DATE OF NAME CHANGE:	19671130

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Young Energy Prize S.A.
		CENTRAL INDEX KEY:			0001468729
		STATE OF INCORPORATION:			N4

	FILING VALUES:
		FORM TYPE:		3/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-05507
		FILM NUMBER:		09958931

	BUSINESS ADDRESS:	
		STREET 1:		7 RUE THOMAS EDISON
		CITY:			L-1445 STRASSEN
		STATE:			N4
		ZIP:			L-1445
		BUSINESS PHONE:		7 495 653-84-03

	MAIL ADDRESS:	
		STREET 1:		7 RUE THOMAS EDISON
		CITY:			L-1445 STRASSEN
		STATE:			N4
		ZIP:			L-1445
</SEC-HEADER>
<DOCUMENT>
<TYPE>3/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2009-07-09</periodOfReport>

    <dateOfOriginalSubmission>2009-07-21</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000061398</issuerCik>
        <issuerName>MAGELLAN PETROLEUM CORP /DE/</issuerName>
        <issuerTradingSymbol>MPET</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001468729</rptOwnerCik>
            <rptOwnerName>Young Energy Prize S.A.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>7 RUE THOMAS EDISON</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>L-1445 STRASSEN</rptOwnerCity>
            <rptOwnerState>N4</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>LUXEMBOURG</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Warrant</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.15</value>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2009-07-09</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-07-09</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4347826</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The initial filing contained an error in the warrant exercise price.  The warrant exercise price is initially $1.20/share.</footnote>
        <footnote id="F2">The warrant exercise price will automatically decrease from $1.20/share to $1.15/share upon the reporting person completing its purchase of additional shares from the ANS Parties pursuant to the First Amendment to the Securities Purchase Agreement dated April 3, 2009 between the reporting person and the Issuer.  The parties are currently in the process of completing the closing of such purchase.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Nikolay V Bogachev, Chief Executive Officer</signatureName>
        <signatureDate>2009-07-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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